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Ultrafast terahertz Spectroscopy of Liquids and Hydrogen Bonded Clusters

Event Details

Event Dates: 

Friday, September 22, 2017 - 4:00pm

Seminar Location: 

  • JILA Auditorium

Speaker Name(s): 

Geoff Blake

Speaker Affiliation(s): 

California Institute of Technology
Seminar Type/Subject

Scientific Seminar Type: 

  • Phys Chem/Chem Phys Seminar

Event Details & Abstract: 

Detailed molecular pictures of the structure and dynamics of liquids drive our understanding of chemistry and biology. While nonlinear 2D infrared and NMR spectroscopies have revealed many specifics of molecular behavior in the condensed phase, the thermally populated motions of liquids, including hydrogen bonds, low-energy bending vibrations, conformational torsions, and hindered rotations, are resonant in the terahertz (THz) region of the spectrum. These motions regulate solvation, macromolecular structure, and vibrational energy flow in liquid phase chemistry. This talk will review recent advances in THz pulse generation that are driving novel nonlinear THz 2D spectroscopies of liquids, that reveal molecular signatures quite distinct from those seen in 2D IR approaches. As these are likely driven by intermolecular interactions, the talk will also present new approaches to THz frequency combs and chirped pulse microwave techniques that have been used to study mixed water-alcohol clusters.

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